Polarization multiplexing PAM4 RoF-FSO system fusing optical fiber link and free space channel

• Main Authors: WANG ANRONG, YUAN JIE, SHAO YUFENG, YANG QIMING, YI LINFANG, LI CHONG, LI YANLIN, ZUO RENJIE, LIU SHUANFAN, CHEN PENG, TIAN QING, YU NI
• Format: Patent
• Language: Chinese; English
• Published: 23.05.2023
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; MULTIPLEX COMMUNICATION; TRANSMISSION

The invention discloses a polarization multiplexing PAM4RoF-FSO system fusing an optical fiber link and a free space channel, which adopts a polarization multiplexing and four-order pulse amplitude modulation mode to generate a polarization multiplexing PAM4 signal at a transmitting end, and transmits the signal through a 25km single-mode optical fiber and a 100mFSO channel at a rate of 10Gbit/s. And the transmission characteristics of the polarization multiplexing RoF-FSO system and the sensitivity of the receiver are tested. A test result shows that a receiving eye pattern of a 10Gbit/s polarization multiplexing PAM4 signal transmitted in a 25km SMF-28 channel and a 100m FSO channel is clear and visible, the signal receiving quality is relatively good, and under the condition that the error rate is 10 <-3 >, the optimal judgment points of two paths of data signals demodulated and restored after polarization demultiplexing are measured to be 0.5 bit and 0.46 bit respectively. The system supports integrated a